| 摘要 |
A safety brake which can be used in conjunction with a conventional drum brake having internal brake shoes to increase the braking force provided by the drum brake. The safety brake of the invention includes an external brake shoe which extends around the outside of the brake drum and contacts the exterior surface of the brake drum. The safety brake of the invention operates on the exterior of the brake drum at the same time the internal brake shoes operate on the interior of the brake drum.
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